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Dynamic beam current control for improved dose accuracy in PBS proton therapy.

C Bula1,2, M F Belosi1, M Eichin1

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Summary
This summary is machine-generated.

Dynamic beam current control in proton therapy enables precise delivery of low-dose spots, improving treatment accuracy. This innovation overcomes limitations of static beam delivery, ensuring all prescribed spots are administered without extending treatment time.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Particle Therapy

Background:

  • Pencil beam scanning in proton therapy uses a step-and-shoot method with a constant beam current.
  • Static operation limits low-dose spot delivery due to beam switch-off latency, potentially compromising treatment plans.
  • This limitation can prevent the accurate administration of low-weighted spots prescribed by treatment planning systems.

Purpose of the Study:

  • To introduce and evaluate a dynamic beam current control system for proton therapy.
  • To overcome the limitations of static beam delivery in pencil beam scanning.
  • To improve the precision of dose distribution in proton therapy treatments.

Main Methods:

  • Implemented dynamic beam current control at PSI Gantry 2, linking the control system to the cyclotron's vertical deflector.
  • Enabled rapid beam current changes (~0.1 ms) for real-time adjustments.
  • Validated the system's clinical operation and its impact on dose delivery.

Main Results:

  • Successfully commissioned and clinically operated the dynamic beam current control system since fall 2017.
  • Demonstrated the capability to dynamically reduce beam current for individual low-dose spots.
  • Confirmed that all prescribed spots were delivered as planned without increasing treatment time.
  • Showed improved dose distribution through two independent validation methods.

Conclusions:

  • Dynamic beam current control is a viable and effective enhancement for pencil beam scanning in proton therapy.
  • This innovation allows for the precise delivery of all prescribed spots, including low-weighted ones.
  • The system improves dose distribution accuracy without compromising treatment efficiency.